<template>
    
  <div>
    <nav-bar>
      <div slot="left" class="back" @click="backClick">
        <img src="~assets/img/common/back.svg" alt="">
      </div>
      <div class="title" slot="center">
        <div v-for="(item,index) in titles" 
            :key="index" class="title-item" 
            :class="{active:index === currentIndex}" @click="titleClick(index)">
            <!-- 为当前点击的，绑定一个class='active' -->
            {{item}}
        </div>
      </div>
    </nav-bar>
      
  </div>
</template>

<script>
import NavBar from "components/common/navbar/NavBar";
export default {
  name: "DetailNavBar",
  components: {
    NavBar,
  },
  data() {
    return {
      titles: ["商品", "参数", "评论", "推荐"],
      currentIndex:0,
    };
  },
  methods: {
    // 导航栏部分，点击
    titleClick(index){
      this.currentIndex = index
      this.$emit('titleClick',index)
    },
    backClick(){
      this.$router.back()
    }
  }
};
</script>

<style scoped>
.title{
  display: flex;
}
.title-item{
  flex: 1;
  font-size: 16px;
}
.active{
  color: hotpink;
}
.back img{
  margin-top: 12px;
}
</style>
